Hey,
So I have been having this issue for the past couple weeks where some games jsut don't boot at all, while others play just fine. Arma 3, for example, won't launch, but CS:GO does. I see it in my task manager but could wait for hours and it still wouldn't come up. Have tried restarting, updating every driver, repairing/reinstalling every game that doesn't work, I even reset my overclock so everything is running at stock. My temps are fine as well... I don't know what else to do!
Edit: I forgot to include my specs.
CPU: i7-6700K @ 4.0GHz
Mobo: MSI Z170A gaming M3
RAM: 16 GB DDR4 something something MHz
GPU: MSI GTX 1070 Gaming X
I don't think much else matters, tell me if you need more though!